Drawing-press.



W. KLOGKE.

DRAWING PRESS.

APPLICATION FILED MAR. 31, 1908.

945,550. Patentd Jan. 4, 1910.

a SHEETS-SHEET 1.

INVENTOR WITNESSES:

' W. KLOCKE.

DRAWING PRESS.

APPLICATION FILED MAR. 31, 1908.

945,550, I Patented Jan. I 10.

5 SHEETS ET 2.

FIG. 4-.

INVENTOR WITNESSES:

. W. KLOUKE.

DRAWING PRESS. A APPLICATION I'ILED 14,512.31, 1908.

Patented Jan. 4, 1910.

5 SHEETS-SHEET 3.

-. INVENTOR W m dizc . W. KLOGKE.

DRAWING PRESS.

APPLICATION FILED MAR. a1, 1908.

Patented Jan. 4, 1910.

5 SHEETS-SHEET 4.

WITNESSES:

W. KLOGKE. DRAWING PRESS.

APPLICATION rmm MAR. 31. 1908.

945,550, 5 Patented Jan. 4, 1910.

6 SHEETS- SHEET 6.

UNITED STATES PATENT. oFFroE.

WILLIAM. KLOCKE, 0115 NEW YORK, N. Y., AGSIGNOR 'TO B. W. BLISS COMPANY, OF

BROOKLYN, NEW YORK, A CORPORATION OF WEST VIRGINIA.

DRAWING-PRESS.

Patented Jan; 4, 1910.

Application filed March 31, 1968. Serial No. 424,315.

I To all whom it may concern:

- stages.

Be it known that I, WILLIAM Knoonn, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Drawing-Presses, of which the following is a specification.

This invention aims to provide certain improvements in drawing presses, the principal features of improvement being especially adapted to what are known as twostep presses which draw the material from a. flat shape to the tubular shape desired in two The invention is also particularly applicable to a toggle-operated press.

Other features of improvement are referred to in detail hereinafter.

The accompanying drawings illustrate an embodiment of the invention.

Figures 1 and 2 are respectively a side and a front elevation of a complete press; Fig. 3 is a cross-section approximately on the line 33 of Fig. 2; Fig. 4.- is a diagrammatic view of the toggles 1n the position in which both punches are lifted; Fig. 5 is a similar view showing the position in which only the outer punch is down, the cams being in section; Fig. 6 is a similar view showing the position in which both punches are down, the planes of section being indicated at 6-6, Fig. 3; Fig. 7 is a side elevation of the lower porti'on'bf the press indicating the mechanism for operating the blank holder; Fig. 8 is a diagram of the same with the cam in a different position from that shown in Fig. 7 Fig. 9 is a diagram of the movements of the punches and the blank holder.

Referring to the embodiment of the invention illustrated, the sheet A is first clamped between the stationary upper blank holder B and the movable lower blank holder and first drawing die C. The inside blank holder or first punch D and the main or second punch E move downward toether, drawing the sheet to the tubular orm of large diameter, after which the hollow member D serves only as a blank holder holding the metal against the re-drawing die F. The second movement is of the punch E alone, and draws the work down to the form of smaller final diameter. The two punches are then withdrawn, and the movable bed G carrying the drawing dies or movable member of the blank holder is then lowered, the

knock-out H remaining stationary and holding up the work so as to permit its removal when the bed and movable member of the blank holder shall have been entirelylowered. The outer punch D is fastened at its upper end to a slide J which is supported from a cross-head K (guided by the side frames N) by means of bolts L so as to be adjustable in height. The slide J and crosshead K are hol1ow,-and the inner punch E passes through them and is supported from a cross-head M which passes through the side frames N of the machine and is raised 7 and lowered by means of links 0 connected atthe'r lower ends to cranks P on a main shaft The fii'st drawing movement is obtained from the same cross-head M. In previous apparatus the means for efi'ecting this first drawing movement have been open toserious objections, especially in that the mechanism interposed between the main cross head and the cross head of the first punch has been subjected to substantial bending strains and has been difficult to adjust and keep in adjustment. According to one feature of this invention a toggle mechanism is used, and in a way to obtain substantial advantages.

Referring to Figs. 4, 5 and 6, the crosshead K of the outer punch is connected by a long toggle link It and a short toggle link S to the side frame N of the machine, and the point of connection of these two toggle links is connected by athird link T with the main crcss head M. At the beginning of the downward movement, the operating link T and the lower toggle link R are nearly in a straight line with each other, so that the pressure is transmitted from the upper to the lower cross head with little or no substantial bending strain upon the intermediate members, and with a nearly synchronous movement. The curves U and V other, and the main cross head stands slightly above the level of the pin'lV. The movement of the second punch beyond the first punch takes place while the pin X moves from the position of Fig. to that of Fig. 6. This pin during this second movement may move in a vertical line without causing a wide variation of the pin W out of line, and

a very substantial variation of the position of the pin W may be effected without involving any serious vertical movement of the lower'cross-headK. Preferably however the pin X during this second movement moves through such an are as to entirely suppress the lateral movement of the pin WV, or to suppress itv to any desired extent. Besides the advantage of a very direct initial movement and afirm clamping operation, it will be observed that in the clampin position of the first punch the two toggle inks are substantially in line, so that there is no transverse strain upon them, and the strain is transmitted very directly and straight to the frame of the machine.

The movement of the pin X through an- 1 on its end with a roller 5 traveling in one of the grooves Z a. Each of the pins X is extended from a square body portion a which is held in a slot d in the main cross-head M, this slot being wider but not' higher than the squared portion 0 of the connecting in. Each connecting pin is capable of slight lateral movement in the cross head, but not of an other movement relatively to the cross ead; and as the cross head -moves= down each of the pins X enters the wide portion a of its cam-groove and is guided into the upper end of the curved groove Z exactly at the end of the first movement.

During the second movement therefore each of the pins X travels through an are controlled by the cam-groove Z, so that it effects a comparatively slight lateral movement of the pin W which connects the two toggle links, which movement is under perfect regulation by the use of cam grooves of a different degree of curvature. This mechanism serves also to transmit through the cam directly to the fixed frame of the machine, any lateral pressureupon the opcrating link T, and to avoid the transmission of any such lateral strain to the cross head in which the pins X are mounted.

The knock-out H is connectedat its lower end to a shaft f (Fig. 1) which through a suitable link and lever connection is held up by one or more counterweights q, regardless of the movements of the movable bed or lower member of the blank holder.

The upward movement of the movable bed G is produced by four links it pivoted at their lower ends on cranks j which are carried in pairs on two shafts is Z. These shafts are provided also with crank arms m a respectively, which are connected to each other by links 0 so as to synchronize the movement of the two shafts, and to transmit the motion of the driven one to the opposite one Z. The turning of-the shaft is is effected by means of a third arm p on this shaft having a pin and roller g traveling in a slot 1' of a cam s mounted onthe shaft Q, as shown in Fig. 2. By this means a very quick lifting and lowering of the movable bed is obtained, with a long dwell during the two successive punching operations, the movement of the bed being indicated by the curve t of Fig. 9.

The operating of the two shafts 7a and Z from a single cam-actuated arm 79 has an advantage over previous constructions in which each of two shafts similar to la and Z have been driven separately. Where the driving arm or similar mechanism of one shaft is broken the other shaft has continued to operate, resulting in a one-sided pressure upon the work, and sometimes in the breakage of other parts of the machine. It is advantageous therefore to operate the two shafts from a single arm as in the described construction.

What I claim is 1. A two step drawing press having an outer punch, an inner punch,'a reciprocating cross-head operating said inner punch directly, and toggle .mechanism for operating the outer punch from said cross-head, the links of said toggle mechanism moving toward the straight position in effecting the drawing movement of said outer punch.

2. A drawing presshaving an outer unch, an inner unch, toggle mechanism or operating sai outer'punch, said mechanism including a pair of toggle links, an operating link connected to said toggle links, and a cross-head operating the inner punch, reciprocating in a directlon approximately parallel to the straight position of the toggle. and connected to said operating link to I actuate the toggle.

3. A drawing press having an outer and an inner unch, toggle mechanism for operating said outer punch, said mechanism including a cross-head operating said inner punch, a pair of toggle links, and an operating link connected to said toggle links and to said cross-head, said outer punch and said cross-head being reci rocable in a direction approximately para lel to the straight position of the toggle.

4. A two step drawing press having an outer punch, an inner punch and toggle mechanism for operating said outer punch, said toggle mechanism including toggle position effects movement of said movable links'R and S and an operating link T, said links R and T being approximately in line in the raised position of said outer punch.

5; A drawing press having a punch-carrying slide and toggle mechanism. for operatin the same, said toggle mechanism including a toggle link R pivoted to said slide, a toggle link S pivoted to a support and to said link R, an operating link T, and a vertically movable cross-head M connected to said link T, said links R and T being approximately at right angles to each other in the advanced position of said cross-head.

6. A drawing press having a punch and toggle mechanism for operating said punch, said toggle mechanism including toggle links R and S and an operating link T, said links R and T being approximately in line in the raised position of the punch, and approximately at right angles to each other in the lowered position.

7 A press having a movable member and toggle mechanism the movement. of whose links toward and from the straight member, actuating means for said links, and additional means for restraining the movement of said links away from their position in line with each other,

8. A press having a punch and toggle mechanism toward the straight position effects a drawing movement of said punch, actuating means for said links, and additional means for restraining said links from movement away from their straight position.

9. A press including a pair of toggle links, an operating link haying one end connected thereto, means for moving the opposite end of said operating link to straighten said toggles, and a fixed member limiting the direction of movement of said opposite end and restraining the movement of the toggle links away from the straight position.

10. A press including a pair of toggle links R and S, an operating link T, a movable cross-head engaging the outer end of said operating link, and a fixed cam Z en-- gaging the outer end of said'operating link T during a portionof the movement of the latter.

In witness whereof, I have hereunto signed my name in'the presence of two subscribing witnesses.

WILLIAM KLOCKE.

Witnesses:

- DOMINGO A. US INA,

THEODORE T. SNELL.

the movement of whose links 

